Actually I think you both were arseholes to the guy - he posted a perfectly reasonable post about getting sick when travelling and you both launched on him. Frequent, you just because that's just how you get your kicks of course.
He doesn't have to justify he choices to anyone and if he choses not to eat meat for "whatever" reason then that's his choice and it's no one else's business and as he says and as is well documented choosing to be vegetarian has no negative effect on your heath and I also doubt it has anything to do with him getting ill particularily when on holiday perhaps either.
As he said is it a bit of wonder people chose not to post here sometimes.......Thankfully he's already decided that two posters just being pure mean wont stop him thankfully.